Which fuels can be obtained by microbial processes ? Why is it necessary to increases the use of such fuels ?

Explanation

i. Methane, ethanol, hydrogen gas, etc. are fuels obtained by microbial processes.
ii. It is necessary to increase the usage of such fules in order to reduce exhaustion of fassil fuel resources.
ii. Majority of these fuels can be obtained by anaerobic decomposition of waste products such as domestic waste, agriculture waste, etc., and thus their cost of production is comparatively very less.
iv. Methane when burned generates comparatively lower amounts of smog-forming pollutants, toxic air contaminats and gases.
v. Ethanol is a clean fuel. It is obtained during fermentation of molasses by Saccharomyces (yeast).
vi. Hydrogen gas is considered the fuel of the future. It does not emit any harmful substances on burning and is produced by bio-photolysis of water.
Thus, due to these advantages it is necessary to increase the use of fuels obtained by microbian processes.